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REMOVAL 1. Remove the heater-A/C housing from the vehicle. See: Housing Assembly HVAC/Service and Repair 2. Remove the foam gasket surrounding the core tubes. NOTE: Notice the orientation of the irregularly shaped gasket on the tubes. The gasket must be placed correctly to ensure proper sealing against the body during reinstallation. 3. Remove the screws and retainers that secure the heater core and tubes to the heater-A/C housing. 4. Remove the mode door actuator if necessary, for clearance to remove the core. 5. Lift the heater core straight up and out of the heater-A/C housing. 6. When replacing individual tubes, loosen and remove the round tube-to-core clamp, and pull tube from core. INSTALLATION 1. When installing individual tubes, insert tube into core ensuring that tube O-ring is seated in core and not pinched. Hold tube in seated position while installing the round tube-to-core clamp. NOTE: The round tube-to-heater-core clamp should be left loose enough to turn the tube in the core. Position the core in the housing, and then tighten the tube-to-heater-core clamp after orienting the tubes to the molded heater-A/C housing. 2. Lower the heater core into the heater-A/C housing. 3. Install the mode door actuator, if removed from housing for core removal. 4. Position the retainers over the heater core tubes. Install and tighten the screws that secure the heater core and retainers to the heater-A/C housing. Tighten the screws to 2.2 Nm (20 in. lbs.). NOTE: The grounding strap is to be attached to the lower heater core tube retainer. 5. Reinstall the heater-A/C housing to the vehicle.

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1. Remove the following component: For a 3.4L engine, remove the air cleaner assembly. For a 3.8L engine, remove the fuel injector sight shield. 2. Drain the coolant. Use Hose Clamp Pliers in order to position aside the heater hose inlet and outlet clamp at the heater core. See Fig. 41 . Disconnect the inlet and outlet heater hose from the heater core. Remove the right and left insulators. Remove the floor carpet around heater core area. 3. Remove the rear floor air outlet duct from the holes in the floor reinforcement. Disconnect the rear floor air outlet duct from the heater core outlet cover. See Fig. 31 . Remove the bolts from the vacuum harness bracket and position bracket aside. NOTE: Position the heater core outlet cover downward and rearward in order to disconnect the cover from the rear area floor duct assembly. 4. Remove the screws from the heater core outlet cover. Remove the heater core outlet cover. See Fig. 32 . Remove the screws from the heater core cover. Remove the heater core cover. Remove and discard the seals from the heater core cover. See Fig. 33 . Remove the caulk from the heater core cover. 5. Remove and discard the outer seal from the heater core. See Fig. 34 . Remove the screw from the heater core line clamp. See Fig. 35 . Remove the heater core retaining clamp. Remove the screw from the heater core pipe retainer clamp. Remove the heater core from the HVAC lower case. See Fig. 36 . 6. Remove and discard the lower seal from the HVAC case. See Fig. 37 . Remove and discard the center seal from the HVAC case. Remove and discard the upper seal from the HVAC lower case. Remove and discard the side seals from the HVAC lower case.